springMVC實現(xiàn)多文件上傳的方式有兩種，一種是我們經(jīng)常使用的以字節(jié)流的方式進行文件上傳，另外一種是使用springMVC包裝好的解析器進行上傳。這兩種方式對于實現(xiàn)多文件上傳效率上卻有著很大的差距，下面我們通過實例來看一下這兩種方式的實現(xiàn)方式，同時比較一下在效率上到底存在著多大的差距。

1.下載相關jar包。需要引入的jar出了springMVC的jar包外，還需要引入com.springsource.org.apache.commons.fileupload-1.2.0.jar和com.springsource.org.apache.commons.io-1.4.0.jar。所有的jar包可以通過“點擊這里”進行下載。

2.配置springAnnotation-servlet.xml文件（文件名稱可以自定義，只要和web.xml中引入的名稱一樣即可）：

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<?xml?version="1.0"?encoding="UTF-8"?>??

<!--?Bean頭部?-->??

<beans?xmlns="http://www.springframework.org/schema/beans"??

????xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"??

????xmlns:p="http://www.springframework.org/schema/p"??

????xmlns:mvc="http://www.springframework.org/schema/mvc"??

????xmlns:context="http://www.springframework.org/schema/context"??

????xmlns:util="http://www.springframework.org/schema/util"??

????xsi:schemaLocation="http://www.springframework.org/schema/beans?http://www.springframework.org/schema/beans/spring-beans-3.0.xsd??

????????????http://www.springframework.org/schema/context?http://www.springframework.org/schema/context/spring-context-3.0.xsd??

????????????http://www.springframework.org/schema/mvc?http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd??

????????????http://www.springframework.org/schema/util?http://www.springframework.org/schema/util/spring-util-3.0.xsd">??

?????

???<!--?注解掃描包?-->??

???<context:component-scan?base-package="com.tgb.web.controller.annotation"></context:component-scan>??

???<!--?代替下面的兩行代碼?-->??

???<mvc:annotation-driven/>??

????

???<!--?靜態(tài)資源訪問?-->??

???<mvc:resources?location="/img/"?mapping="/img/**"/>??

????<mvc:resources?location="/js/"?mapping="/js/**"/>??

?????

?????

???<bean?id="viewResolver"?class="org.springframework.web.servlet.view.InternalResourceViewResolver">??

????????<property?name="prefix"?value="/"></property>??

????????<property?name="suffix"?value=".jsp"></property>??

??????

???</bean>??

?????

???<bean?id="multipartResolver"?class="org.springframework.web.multipart.commons.CommonsMultipartResolver">??

????????<property?name="defaultEncoding"?value="utf-8"></property>???

????????<property?name="maxUploadSize"?value="10485760000"></property>??

????????<property?name="maxInMemorySize"?value="40960"></property>??

???</bean>??

</beans>??

3.?配置web.xml文件：

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<?xml?version="1.0"?encoding="UTF-8"?>??

<web-app?xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"?xmlns="http://java.sun.com/xml/ns/javaee"?xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"?xsi:schemaLocation="http://java.sun.com/xml/ns/javaee?http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"?id="WebApp_ID"?version="2.5">??

??<display-name>springMVC1</display-name>??

??<welcome-file-list>??

????<welcome-file>index.html</welcome-file>??

??</welcome-file-list>??

????

??<servlet>??

?????<servlet-name>springMVC</servlet-name>??

?????<!--?springMVC的分發(fā)器?-->??

?????<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>??

?????<init-param>??

????????<param-name>contextConfigLocation</param-name>??

????????<param-value>classpath*:config/springAnnotation-servlet.xml</param-value>??

?????</init-param>??

?????<!--?表示當Tomcat已啟動的時候初始化這個Servlet?-->??

?????<load-on-startup>1</load-on-startup>??

??</servlet>??

????

??<filter>????

??????<filter-name>encodingFilter</filter-name>????

??????<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>????

??????<init-param>????

??????????<param-name>encoding</param-name>????

??????????<param-value>UTF-8</param-value>?<!--設置你想用的字符集，我這里用的是GB18030-->????

??????</init-param>????

??????<init-param>??

????????<param-name>forceEncoding</param-name>??

????????<param-value>true</param-value>??

??????</init-param>??

??</filter>????

??????

??<filter-mapping>????

??????<filter-name>encodingFilter</filter-name>????

??????<url-pattern>/*</url-pattern>?<!--設置你想過濾的頁面或者是Servlet，根據(jù)自己的需要配置-->????

?</filter-mapping>????

???

??<servlet-mapping>??

????<servlet-name>springMVC</servlet-name>??

????<url-pattern>/</url-pattern>??

??</servlet-mapping>??

</web-app>??

4.?jsp頁面代碼：
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<%@?page?language="java"?contentType="text/html;?charset=UTF-8"??

????pageEncoding="UTF-8"%>??

<!DOCTYPE?html?PUBLIC?"-//W3C//DTD?HTML?4.01?Transitional//EN"?"http://www.w3.org/TR/html4/loose.dtd">??

<html>??

<head>??

<script?type="text/javascript"?src="../js/jquery-1.7.2.js"></script>??

<meta?http-equiv="Content-Type"?content="text/html;?charset=UTF-8">??

<title>Insert?title?here</title>??

<script?type="text/javascript">??

????i?=?1;??

????j?=?1;??

????$(document).ready(function(){??

??????????

????????$("#btn_add1").click(function(){??

????????????document.getElementById("newUpload1").innerHTML+='<div?id="div_'+i+'"><input??name="file"?type="file"??/><input?type="button"?value="刪除"??onclick="del_1('+i+')"/></div>';??

??????????????i?=?i?+?1;??

????????});??

??????????

????????$("#btn_add2").click(function(){??

????????????document.getElementById("newUpload2").innerHTML+='<div?id="div_'+j+'"><input??name="file_'+j+'"?type="file"??/><input?type="button"?value="刪除"??onclick="del_2('+j+')"/></div>';??

??????????????j?=?j?+?1;??

????????});??

????});??

??

????function?del_1(o){??

?????document.getElementById("newUpload1").removeChild(document.getElementById("div_"+o));??

????}??

??????

????function?del_2(o){??

?????????document.getElementById("newUpload2").removeChild(document.getElementById("div_"+o));??

????}??

??

</script>??

</head>??

<body>??

??

?????<h1>springMVC字節(jié)流輸入上傳文件</h1>???

????<form?name="userForm1"?action="/springMVC7/file/upload"?enctype="multipart/form-data"?method="post">??

????????<div?id="newUpload1">??

????????????<input?type="file"?name="file">??

????????</div>??

??????????

????????<input?type="button"?id="btn_add1"?value="增加一行"?>??

????????<input?type="submit"?value="上傳"?>??

????</form>???

????<br>??

????<br>??

????<hr?align="left"?width="60%"?color="#FF0000"?size="3">??

????<br>??

????<br>??

?????<h1>springMVC包裝類上傳文件</h1>???

????<form?name="userForm2"?action="/springMVC7/file/upload2"?enctype="multipart/form-data"?method="post"">??

????????<div?id="newUpload2">??

????????????<input?type="file"?name="file">??

????????</div>??

????????<input?type="button"?id="btn_add2"?value="增加一行"?>??

????????<input?type="submit"?value="上傳"?>??

??????????

??????????

????</form>???

</body>??

</html>??

5.實現(xiàn)上傳功能的java bean：
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package?com.tgb.web.controller.annotation.upload;??

??

import?java.io.File;??

import?java.io.FileInputStream;??

import?java.io.FileOutputStream;??

import?java.io.IOException;??

import?java.io.PrintWriter;??

import?java.io.UnsupportedEncodingException;??

import?java.net.URLDecoder;??

import?java.util.Date;??

import?java.util.Iterator;??

??

import?javax.servlet.http.HttpServletRequest;??

import?javax.servlet.http.HttpServletResponse;??

import?javax.swing.filechooser.FileNameExtensionFilter;??

??

import?org.springframework.stereotype.Controller;??

import?org.springframework.web.bind.annotation.RequestMapping;??

import?org.springframework.web.bind.annotation.RequestMethod;??

import?org.springframework.web.bind.annotation.RequestParam;??

import?org.springframework.web.multipart.MultipartFile;??

import?org.springframework.web.multipart.MultipartHttpServletRequest;??

import?org.springframework.web.multipart.commons.CommonsMultipartFile;??

import?org.springframework.web.multipart.commons.CommonsMultipartResolver;??

import?org.springframework.web.servlet.ModelAndView;??

??

??

import?com.tgb.web.controller.entity.User;??

??

@Controller??

@RequestMapping("/file")??

public?class?UploadController?{???

??????

??????

????@RequestMapping("/upload"???)??

????public?String?addUser(@RequestParam("file")?CommonsMultipartFile[]?files,HttpServletRequest?request){??

??????????

????????for(int?i?=?0;i<files.length;i++){??

????????????System.out.println("fileName---------->"?+?files[i].getOriginalFilename());??

??????????

????????????if(!files[i].isEmpty()){??

????????????????int?pre?=?(int)?System.currentTimeMillis();??

????????????????try?{??

????????????????????//拿到輸出流，同時重命名上傳的文件??

????????????????????FileOutputStream?os?=?new?FileOutputStream("H:/"?+?new?Date().getTime()?+?files[i].getOriginalFilename());??

????????????????????//拿到上傳文件的輸入流??

????????????????????FileInputStream?in?=?(FileInputStream)?files[i].getInputStream();??

??????????????????????

????????????????????//以寫字節(jié)的方式寫文件??

????????????????????int?b?=?0;??

????????????????????while((b=in.read())?!=?-1){??

????????????????????????os.write(b);??

????????????????????}??

????????????????????os.flush();??

????????????????????os.close();??

????????????????????in.close();??

????????????????????int?finaltime?=?(int)?System.currentTimeMillis();??

????????????????????System.out.println(finaltime?-?pre);??

??????????????????????

????????????????}?catch?(Exception?e)?{??

????????????????????e.printStackTrace();??

????????????????????System.out.println("上傳出錯");??

????????????????}??

????????}??

????????}??

????????return?"/success";??

????}??

??????

??????

????@RequestMapping("/upload2"??)??

????public?String?upload2(HttpServletRequest?request,HttpServletResponse?response)?throws?IllegalStateException,?IOException?{??

????????//創(chuàng)建一個通用的多部分解析器??

????????CommonsMultipartResolver?multipartResolver?=?new?CommonsMultipartResolver(request.getSession().getServletContext());??

????????//判斷?request?是否有文件上傳,即多部分請求??

????????if(multipartResolver.isMultipart(request)){??

????????????//轉換成多部分request????

????????????MultipartHttpServletRequest?multiRequest?=?(MultipartHttpServletRequest)request;??

????????????//取得request中的所有文件名??

????????????Iterator<String>?iter?=?multiRequest.getFileNames();??

????????????while(iter.hasNext()){??

????????????????//記錄上傳過程起始時的時間，用來計算上傳時間??

????????????????int?pre?=?(int)?System.currentTimeMillis();??

????????????????//取得上傳文件??

????????????????MultipartFile?file?=?multiRequest.getFile(iter.next());??

????????????????if(file?!=?null){??

????????????????????//取得當前上傳文件的文件名稱??

????????????????????String?myFileName?=?file.getOriginalFilename();??

????????????????????//如果名稱不為“”,說明該文件存在，否則說明該文件不存在??

????????????????????if(myFileName.trim()?!=""){??

????????????????????????System.out.println(myFileName);??

????????????????????????//重命名上傳后的文件名??

????????????????????????String?fileName?=?"demoUpload"?+?file.getOriginalFilename();??

????????????????????????//定義上傳路徑??

????????????????????????String?path?=?"H:/"?+?fileName;??

????????????????????????File?localFile?=?new?File(path);??

????????????????????????file.transferTo(localFile);??

????????????????????}??

????????????????}??

????????????????//記錄上傳該文件后的時間??

????????????????int?finaltime?=?(int)?System.currentTimeMillis();??

????????????????System.out.println(finaltime?-?pre);??

????????????}??

??????????????

????????}??

????????return?"/success";??

????}??

??????

????@RequestMapping("/toUpload"?)???

????public?String?toUpload()?{??

??????????

????????return?"/upload";??

????}??

??????

}??

6.最后看后臺打印數(shù)據(jù)，數(shù)據(jù)來源于后臺打印的上傳文件所用的時間，第一幅圖片是使用字節(jié)流寫入方式完成三個文件上傳中每個文件用時，第二幅圖片是使用springMVC包裝好的解析器進行的三個相同的文件上傳中每個文件的用時：

字節(jié)流實現(xiàn)文件上傳的傳遞效率，結果顯示傳遞三個文件用時分別為534ms，453ms和387ms。

使用springMVC解析器進行文件上傳用時分別為2ms，1ms和2ms。

通過對比這兩種方式我們可以發(fā)現(xiàn)使用springMVC進行多文件的效率顯然要比字符流寫入方式效率上要高得多。

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